lib/xgame/chipmunk.rb @@ -2,6 +2,7 @@ $LOAD_PATH << File.dirname(__FILE__) + '/../lib/' require 'xgame' +require 'xgame/chipmunk' XGame('Two Pandas!') { |screen, world, listeners| examples/2panda @@ -2,6 +2,7 @@ $LOAD_PATH << File.dirname(__FILE__) + '/../lib/' require 'xgame' +require 'xgame/chipmunk' XGame('The Panda') { |screen, world, listeners| examples/panda @@ -2,6 +2,7 @@ $LOAD_PATH << File.dirname(__FILE__) + '/../lib/' require 'xgame' +require 'xgame/chipmunk' XGame('Spider Panda') { |screen, world, listeners| examples/spiderpanda @@ -3,7 +3,6 @@ begin require 'rubygame' - require 'chipmunk' # If we are operating without rubygems (preferred) some features are still nice # define the Gem class to keep a standard API @@ -36,30 +35,8 @@ begin rescue LoadError require 'rubygems' require 'rubygame' - require 'chipmunk' end -# Extend the CP namespace -module CP - INFINITY = 1.0/0.0 - - module Shape - attr_accessor :sprite - end - - class Vec2 - ZERO = self.new(0,0) - - def [](k) - case k - when 0: x - when 1: y - else raise ArgumentError.new("Bad CP::Vec2 'index' #{k}") - end - end - end - -end # Extend the Rubygame namespace module Rubygame @@ -93,17 +70,6 @@ module Rubygame end end - class Rect - def shape_for(body) - CP::Shape::Poly.new(body, vertices, CP::Vec2::ZERO) - end - - def vertices - # Centre of gravity is at 0,0 body position translates to centrex, centrey - [CP::Vec2.new(width/-2, height/-2), CP::Vec2.new(width/-2, height/2), CP::Vec2.new(width/2, height/2), CP::Vec2.new(width/2, height/-2)] - end - end # end Rect - # Extend the Sprites namespace module Sprites @@ -147,183 +113,6 @@ module Rubygame end # class ImageSprite - # This is a class for Sprites to be used with the Chipmunk Physics Engine - # It is a subclass of ImageSprite since overriding defaulit_image - # with any Surface solves not having an image file - class ChipmunkPhysicsSprite < ImageSprite - - attr_accessor :shape - - def default_mass; 5; end - - def initialize(x, y, mass=nil, moment=nil, image=nil) - super(x, y, image) - mass = default_mass unless mass - moment = CP::moment_for_poly(mass, @rect.vertices, CP::Vec2::ZERO) unless moment - body = CP::Body.new(mass, moment) - @shape = @rect.shape_for(body) - @shape.sprite = self - @shape.u = 1.0 # Need some default friction value - body.p = CP::Vec2.new(rect.centerx, rect.centery) - @going = { :left => 0, :right => 0, :up => 0, :down =>0 } - @jumps = 0 - end - - def velocity - @shape.body.v - end - - def moving?(direction) - return velocity.x > 0 if direction == :right - return velocity.x < 0 if direction == :left - return velocity.y > 0 if direction == :down - return velocity.y < 0 if direction == :up - false - end - - # Go in some direction [vx, vy]. If either is nil, motion on that axis will not be affected. - def go(v) - if v[0] - @going[:left] = v[0]*-1 if v[0] <= 0 - @going[:right] = v[0] if v[0] >= 0 - end - if v[1] - @going[:up] = v[1]*-1 if v[1] <= 0 - @going[:down] = v[1] if v[1] >= 0 - end - @shape.surface_v = CP::Vec2.new(@going[:left] + @going[:right]*-1, @going[:up] + @going[:down]*-1) - end - - # Stop some component of motion - def stop(direction) - @going[direction] = 0 - @shape.surface_v = CP::Vec2.new(@going[:left] + @going[:right]*-1, @going[:up] + @going[:down]*-1) - end - - # Apply a constant force along a certain vector - def apply_force(force) - case force - when Array - @shape.body.apply_force(CP::Vec2.new(force[0], force[1]), CP::Vec2::ZERO) - when CP::Vec2 - @shape.body.apply_force(force, CP::Vec2::ZERO) - else - raise ArgumentError.new("Bad type for force: #{force.class}") - end - end - - def jump(v=[0, -1000]) - if @jumps < 1 - apply_impulse v - @jumps += 1 - end - end - - def reset_jumps - @jumps = 0 - end - - # Apply a momentary force impulse - def apply_impulse(impulse) - case impulse - when Array - @shape.body.apply_impulse(CP::Vec2.new(impulse[0], impulse[1]), CP::Vec2::ZERO) - when CP::Vec2 - @shape.body.apply_impulse(impulse, CP::Vec2::ZERO) - else - raise ArgumentError.new("Bad type for impulse: #{force.class}") - end - end - - def update(time) - super - #@image = @image.rotozoom(@shape.body.a, 1) - rect.centerx = @shape.body.p.x - rect.centery = @shape.body.p.y - end - - end # ChipmunkPhysicsSprite - - module ChipmunkPhysicsSpaceGroup - - # Get the Chipmunk Space - def space - @space ||= CP::Space.new - end - - # adds a collision callback (usually done by a listener) - def add_collision_func(by, to) - @space.add_collision_func(by, to) { |by, to| yield by, to } - end - - # Set the gravity (set in a vector so that horizontal "gravity" is also possible) - def gravity=(v) - case v - when Array - space.gravity = CP::Vec2.new(v[0], v[1]) - when CP::Vec2 - space.gravity = v - when Numeric - space.gravity = CP::Vec2.new(0, v) - else - raise ArgumentError.new("Invalid gravity value type #{v.class}") - end - end - - # Get the current gravity - def gravity - space.gravity - end - - # Set the damping/friction across all space - def damping=(v) - space.damping = v - end - - # Add a sprite to this group - def <<(sprite) - unless self.include? sprite - super - return unless sprite.respond_to?:shape - space.add_body sprite.shape.body unless sprite.shape.body.m == CP::INFINITY - space.add_shape sprite.shape - end - end - - # Add bounds to sides of a rectangle (usually the screen) - def bound(screen, side) - case side - when Array - side.each { |side| bound(screen, side) } - return - when :top - side_shape = CP::Shape::Segment.new(CP::Body.new(CP::INFINITY, CP::INFINITY), CP::Vec2::ZERO, CP::Vec2.new(screen.width, 0), 0) - side_shape.body.p = CP::Vec2.new(0, 0) - when :bottom - side_shape = CP::Shape::Segment.new(CP::Body.new(CP::INFINITY, CP::INFINITY), CP::Vec2::ZERO, CP::Vec2.new(screen.width, 0), 0) - side_shape.body.p = CP::Vec2.new(0, screen.height) - when :left - side_shape = CP::Shape::Segment.new(CP::Body.new(CP::INFINITY, CP::INFINITY), CP::Vec2::ZERO, CP::Vec2.new(0, screen.height), 0) - side_shape.body.p = CP::Vec2.new(0, 0) - when :right - side_shape = CP::Shape::Segment.new(CP::Body.new(CP::INFINITY, CP::INFINITY), CP::Vec2::ZERO, CP::Vec2.new(0, screen.height), 0) - side_shape.body.p = CP::Vec2.new(screen.width, 0) - else - raise ArgumentError.new("Invalid side to bound #{side}") - end - side_shape.collision_type = :wall - side_shape.u = 1.0 - space.add_static_shape side_shape - end - - # Update the Chipmunk space - def update(time, *args) - super - space.step(time/1000.0) - end - - end # ChipmunkPhysicsSpaceGroup - module BackgroundGroup attr_reader :background lib/xgame.rb @@ -3,6 +3,7 @@ # Test that it loads $LOAD_PATH << File.dirname(__FILE__) + '/../lib/' require 'xgame' +require 'xgame/chipmunk' puts 'XGame loaded' tests/xgame_test.rb 69d416ec0f2a4b14b4a37372a69504830b4befe1 Stephen Paul Weber singpolyma@singpolyma.net http://github.com/singpolyma/xgame/commit/ac1f0e731ecb073a3fc18fe498fc7dfc7f218ce3 ac1f0e731ecb073a3fc18fe498fc7dfc7f218ce3 2008-12-10T19:14:14-08:00 2008-12-10T19:14:14-08:00 Break out chipmunk requirement. Let developers only include chipmunk if they need it (anything that doesn't need physics). Use require 'xgame/chipmunk' to get it. Updated examples and tests. 31f5f524a959bc1237bef1a520b95caf66260e30 Stephen Paul Weber singpolyma@singpolyma.net